In what episode does Brook join the Straw Hats Pirates crew?

In what episode does Brook join the Straw Hats Pirates crew?

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In which episode of One Piece does Brook join the Straw Hat Pirates? - Quora

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In which episode of One Piece does Brook join the Straw Hat Pirates? - Quora

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Who were your Straw Hat candidates? Those characters that you were sure Oda introduced as future crew members but at the end didn't join in? Mine are these eight. : r/OnePiece